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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2451309fa5f52161ee2d721e45724441a52cead15d5600536ed63d5cad652e0d' 
  AND token = 'aoSHiu9VYJkJM1Cky8vUqnH5JcKroTQQcgG2rvqZ1nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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