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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0249c7dba1ce947e353ee79699aa47d8aca8f529c9f119783c1c5c4f36a63dbb' 
  AND token = 'EuNj4ulyI8JwAaGm9yrsfDl1QWwr2Vf//97yD1I3cPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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