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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db900ec74c33bd64e7057862f4ea4c87b7494a0ad10c38a5e057819f2921e2a9' 
  AND token = 'fvvsUSRmPViQ+4OmXtMVX40ijOk/iuUa+SCjp2jPxXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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