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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e081a513628797e22d24817bf329f3c387d94d74722cf4f68ce30589e1528b94' 
  AND token = 'SN86fSB3utjSAcU4KgMWVBdJFm5xq1dxhO7WVP+smus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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