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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6030dca9cdb6d5eb1b64fe45aec124082768dc013faa87aefdbc35e23453e83' 
  AND token = 'oQdXrYIoG0kaRzPwZms1wMoMdHDiqG0CHky8T2tbNPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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