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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f72b642c67b7f4e1c8eb7732c7505e713387fa21fe8715bc0fd5031ab2f3f035' 
  AND token = 'Yh0bKEl0stmNn9GgffIN9NQbotk/KRczUbr3JV8G4Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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