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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b30a775d05671266d43236025eb8c80495d3012a6696220c1c740b5f5b89b6' 
  AND token = 'V7Ag+8M9ms17s3EMCx8TdPpnIdathOdBFyNSjhpwC10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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