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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fe1c77fbb2708c98e8958d062efe2c87a62760bc6c2b78c29b8f6c570fb055b' 
  AND token = 'xV6hSU4r5dImfG0DZtLBDFp0SVR45+O7Z+ZaJ2OXQpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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