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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b4c2245fae3459e0a4a050a73220ea7e2d1ca1ad0e47985f33f3d31a07f9e8' 
  AND token = 'cFlBD7Ge2y3/oH3ngxUfom3LkGKQja0DooqHH2cU1kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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