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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9277b8d850fd32d2601c2d462645a0aa1984423f819c0a58e16556411d4deddd' 
  AND token = 'bVpx+YMUk+IOgbkoH0IMuAR2KF8qoTBR5KmfLrkVxaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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