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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f000a529bd54bfa18e21b79363fa7dc73f528f5a8da3dede8064d4bc286a1b74' 
  AND token = 'pmo81KCuIIh4q/YFIX8f87KjAhdHmS2nreSnSQVfn2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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