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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e1bb86aadf969f8d8e50116fe3e6f7ae73ac8b58ed2c34abc9f7ee3b8593380' 
  AND token = 'YPNh19LqVLF4rHn7yCfpewQeofTyjSChNpmLpG9yMzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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