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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28aa120a846e5f35439ec68f40f1beca66f1532a27809ef4e521e8af5a152c5b' 
  AND token = 'RCkFVALlM7iuROhR7w/ToFngApUmuWt/XNxpQ3zpGXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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