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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd366fc0a5c0495c0e9a13f6e78b975eb76abd14bc40d7d427a1db39201242a' 
  AND token = 'eaU+CNBAyhHFnw6kSFc9+usV+IWV6pJ4rULMdtSLUA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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