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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c423db5f86fc67d647fc557bd951d3b04c9574fea6d059b9f3fb337c58e2235' 
  AND token = 'fIzMHxLQraxKLQXJnMbitkdYXkIlARDPkuwvNUKACb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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