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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4158e7808b028f88d8dcd0fda6bc8d73ed9c5f44198c33c171eaa9ab5baf215' 
  AND token = 'YXDChB/EXeyJbN6jxEOAZA4Zo/B3VyYPXEFFqgrwato=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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