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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1bc4cc09ddee4ba530704e44ff3eb97365ba290d7b721167dcc8a0d73b3a40' 
  AND token = 'OyGpcXrqb7soJeWpuD2V1Fh5tiI3vXJF8aR2M8v2n1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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