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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b3fe38cd9ec93a2935b10d431a3ffdf136536bb5530024b415c9b44d90f254' 
  AND token = 'Vmvg/dpPYVRuQwLEouOx/ozOQEQYg6HnjQgTGf+V59k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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