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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9662bf38ab432f5f183926faaa87b0e6a4b498aac879d6794664a82ec28f8f50' 
  AND token = 'CR0xzOMCui8bB6wFikLa8rejG6gEwgIH7xmtMSIdXj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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