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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e69e1aa1508c739e915c15168a4b0ec2e12a58f5e932ecf3cc78849ef0d11a3' 
  AND token = 'RcN4q8+rntVCupFXc3Kak1u8JMGJn9IcOL26lmgfSPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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