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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a860bd6fb10456c2389293ed36e17406775ab2d98a4b6fbc319dc8167d71ab04' 
  AND token = 'tZ3K0jk469j4rfzlpfOVLWClsyF1o33mi90ldPNI0m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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