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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de6895e7c4426af4d72700d75f334ec2c3d23b01bc5da4014c4d51a59d69cbc5' 
  AND token = 'aiFdpqzV6HbcBzdmr7bdFqcADxDUV37S5bTZtXdSflk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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