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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0346d6e76c5bf7ced7c2397e0aa0a4e5bb93a96a0d1cd3e08e8458b4f410ae' 
  AND token = '0KNdvinCdncPm4RblFGAk5p6M4PYeofLC488kiNoS/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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