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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970802f9e09e2f024911aa74c136b63506255da84368af0f1afb10eee789f0db' 
  AND token = 'JyMwRKvaw0b3xTO+c3Luazor8VKOElb+NaYYt5GhOMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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