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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '345229dc66e6ca6666ce02db2e0fd0f7dd0c4f3fd53f25dbf628de8932b07296' 
  AND token = 'cv2rCEgK9U0GlnWZX8hrVEhe47rj3vqCft9bogH/wJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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