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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7356b6730cad9d4c42aecc0cdfe33b2999213ca1d93011f927c12a79da4f4a9a' 
  AND token = 'tnXeg8K8rTQFaP9D+Su7RuV99TMGa37H2JRempYl/uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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