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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ecfd43d0c1a7d4f3f6a0ab1014622e48a1c8a46ae4d8c6a273487b8fdccdda' 
  AND token = '0sAT5MT9E2+5KlVlz1t+Bn/ynzlRcnFOrq2w+uPAU58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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