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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f19a951a107cd10323c97285188cc57fc36044d8f0b1340dc63782e7fe240e' 
  AND token = 'Xdq/5yTo/z9CvLlU4dHgJJcHlPo8HufnMVQ8A0nsEqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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