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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5422d6787ebc6b8690833f2444eb60c17bef630d624f5b05098e74a4ee13478' 
  AND token = 'NS5RsT54Bv5ooDzR2M91JEimOBD+gURaSENe5ULQPIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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