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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367a19a019ed89fff3b7e98f7aa56218e74314e20e2866d11fa6a9126086ca1b' 
  AND token = 'Qds9C8KQ4g+2sSUsyFprilAAgxLHo0i2Ga3XeV8Xt4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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