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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '416fb0ae6a82ba1a8f075c08808f35eb3264437c9fbf93e55121185e62c23ff6' 
  AND token = 'owVJplqnNFOOxt47lX4rIjrAnzw8c2ixdae/fYeUj+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}