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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '183f8d8e43ceae26980354874ea61ced63c3ff2d87f089dd86b6e135295bbcd9' 
  AND token = 'dPt34DwCT37eY2UxYyW38jZp0Ma9y59w3TH67/T7D2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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