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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06794d378ee4b7991e10f6b81c40d19b2a78ec2fe9a1966ea70d5353186237a1' 
  AND token = '4J9FgPKiajm9TKTKJaXijbyrGeN7eNxYbV5mXw8m2O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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