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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e3911f0babed696b67d87d3a155c0603a6c9ae24309077b42456d45804dd76c' 
  AND token = '4alT32spO6aoh1XJBcd20ZlEVvUN9PiMw9DYz96/zNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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