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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de501c9b2cc63da1abcc6f4feec9b1c73e85ab30ae2686531c11505af2b7b409' 
  AND token = 'jLoLL+M8+ljZSoRsHZVifkfPV6x7bTHLaB3YMPPS4WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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