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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b442e44bbb261b353d927662e1acaef62097d0ce3a516242a51de80e2cd36b66' 
  AND token = 'loq0akJWcu8hmJh/DbS2ribJVJpkWUIfKk2amo6iols=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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