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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98def6dc2a9454e2784e0133b60e187bd8b01af4c8170ac56f69d6f56bf68876' 
  AND token = 'fwVul2JO5ibjtSntr1op/r20nT2jnLbBVAKIZH4KdxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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