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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b52ffa7e545f77b214c813a73c5d6ce3e9f3c7490318f8e285288101d22b32a8' 
  AND token = 'BzETPu+j7ooYl8EtCRVC7sNQ5tjBo+cjisb3kFI8Twk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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