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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '844f42dca2f0ecd8dc04eb41de3d0d2bfaecb94e37b1cf89e29869b71189a7cc' 
  AND token = 'Fqs+04IMyv5z0kIg9RSDvuRd94JxhWvQHBqLBQaoo7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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