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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b767d19c00fd6f4f336b254226452feda6d105fbb0a07c69c2bde956329f0f3' 
  AND token = 'H70hmokYJJj4tqDEisHJe5Z0e/Nd+Lv9H9cPkbFZ9Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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