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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620f26fdf71ee361de76a1ed19be9b07943b94a26ec4efe5fd6cd9d3515fb28a' 
  AND token = 'SVetG13U1/vD9eRbBNGnsTL3n+TMgJWAFBp90jr0xfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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