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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8212f326f599d14438780fe8572226f2557f457ac6a5e9b8c776f175704ff4f5' 
  AND token = 'rMdfjhbhGEGank6X5YF/Dh4fZvpnlh0c7OEVqI8ulVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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