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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf31c017d3d89ed842c8e02222ffd85aa39a3273cebbfe59c3201f8a1e124266' 
  AND token = 'Nj4IxpRgvuzIoI/24UI3JHitCeZ2KUFdprPSKZxujaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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