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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc36245388d1feef64cdaaf410a0337a7a15f8a5235faf94f1f2a8c104ca3a85' 
  AND token = 'B0aPONZM2mfu1S2ae3ziegAATc8dW5czEaADDemebt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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